617 anyone know this gang tatoo means? plz read

This guy who is my brothers neighbor used to be in the hood and he was in penatentry and everything like that. Anyways he is cool with my brother and his roomates and stuff and watches out for thema and he is better now cause he has a wife and kids so he has strengtend out. but we asked what his 617 tatto on his arm meant and he told us you dont want to know and he really stressed that. Anyways he said it is an area code in california but thats not what it means on his arm. So i was wondering if anyone knows what the 617 symbol on his arm means cause i cant stop thinkin about it. Im not sure if anyone knows but its worth a try to ask

This guy who is my brothers neighbor used to be in the hood and he was in penatentry and everything like that. Anyways he is cool with my brother and his roomates and stuff and watches out for thema and he is better now cause he has a wife and kids so he has strengtend out. but we asked what his 617 tatto on his arm meant and he told us you dont want to know and he really stressed that. Anyways he said it is an area code in california but thats not what it means on his arm. So i was wondering if anyone knows what the 617 symbol on his arm means cause i cant stop thinkin about it. Im not sure if anyone knows but its worth a try to ask